Underreamer.



F. A. HAUGH.

UNDERREAMER.

APPLICATION FILED APR. 21, 1914.

SHEET 1.

Patented Apr.

H E ETS- fidi@ 5 x E@ WE @W F. A. HAUGH.

UNDERREAMER.

APR. 21,1914

APPLICATION FILED Patented Apr. 27, 1915.

2 SHEETS-SHEET 2.

a sas rannte orare..

' raam: A. Haven, or mnnrnnnnivcn, Kansas;

s UNDERREAMER.

object being'to provide a tooLofthis character which includes a body having a plurality of expansible and detachable cutters connected therewith, together with7 meansy by which the cutters may be maintained in collapsed, unobstructing position while passing through the casing, but which will expand the cutters so as to render the same operative as soon as the reamer has emerged from the lower end of the casing.

A further object of the invention 'is to provide a tool of the class described wherein the means for expanding the cutters is adapted to secure the same rigidly in their operative positions, but is adapted to be rendered inoperative by an actuating device which engages the lower end of the casing as the reamer enters the same in being withdrawn after the cutting operation has been completed.

A still further object is the provision of an under-reamer whose parts are simply constructed and few in number so as to be capable of being assembled or detached readily for the purpose of repair, and whereby the tool is rendered extremely" durable and also inexpensive in the cost of manufacture. The invention consists inthe features of construction, combination, ment of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which: Figurelis a sidey elevation of the tool showing thecutters andthe plunger inoperative while the device is passing through a well casing; Fig. Zisa similar view showing the cutters andthe plunger in their operative positions, the casing being omitted; Fig. 3 is a front elevationy of the same; Fig. 4c is a bottom plan view; Fig. 5 is a longitudinal sectional view'on line 5-5 of vFig. l; Fig.

6 is a similar view on line 6 6 of Fig. 3;

Fig. 7 is a transverse sectional View online 7-7 .of lFig. 5; and, Fig. 8 is a detail perspectlve view of one of the cutters.

Specification of Letters Patent.

and l arranget Patented Apr. 2"?, 19115..

Application led April 21, 1914. Serial No. 833,467.

ln the drawings, the numeral 1 designates the cylindrical body of the tool which is,pro vided inits lower end with a socket\2 in which a cylindrical vsupporting member 3 is adaptedV to be mounted and to be secured therein by means of a transverse pin 4, which latter is adapted to extend through an opening 5 in the body 1 and a registering groove 6 in the supporting member, the lower end of the socket 2 isenlarged as at 7 and an annular groove 8 is provided in the socket adjacent'to the said end. The" bottom wall 9 of the groove 8 is cut at a forty-live degree angle to the longitudinal axis of the body' whereas the upper'wall thereof is frustoconical in shape, it being inclined to the said axis. A plurality of cutters 1,0, each of which is substantially segmental in trans-- said groove so as to fit snugly therein when in their expanded, `roperative positions',

wherein theirshoulders 12 abut the marginal portion of the lower end of the body. The reduced portionsll ofthe cutters are thus provided above the shoulders 12 with opposedvshoulders 13 for engagement with the bottom wall 9 of the groove 8. Arllhe upper ends of the cutters are provided with radially disposed openings 14 for thereception of the supporting pins 15 which project outwardly from the reduced lower end 16 of the supporting member 3. These pins are loosely engaged within the said openings so as to permit slight swinging movement of the cutters in expanding and collapsing.

' The body 1 is providedin communication with its socket 2 with an upwardly p rojecting central bore 17, and the supporting member 3 is yprovided with a medial bore 18 in registration therewith, for the recep- A to expand the upper ends of the cutters so that they will fit securelyzwithin the socket groove 8, when the plunger is moved upwardly. The lower end portions of the inner faces of the cutters are 4inclined 'more abruptly and are adapted for engagement by a second 'expanding and reinforcing head 22, which latter is constructed frusto-coni- `cal in shape like the enlargement 21 but l is provided in its outer periphery witha dove-tailed slot 24 which extends longitudinally therein and is adapted to receive a guide key 25. This key is adapted` to project from the key slot in the supporting' member lfor sliding engagement within -a registering key slot 26 in the body socket 22, Owing to the provision of this guide key, the supporting member will be guided during its upward movement in assembling the same within the Abody socket,lwhereby the recess 6 in the ,said body will be brought into proper registration with the body openmg 5.

The body 1 is provided above the socket 2 with al longitudinally extending slot 27 which opens through the sides thereof and is' adapted for the reception of a crosshead 28, which latter is vertically lslidable therethrough and is connected medially in a detachable 4manner with the upper end of the plunger 19.y A helical compression spring 29 is mounted upon the plunger between the lower wall of the body slot 27 and the cross-head. f This spring is adapted normally to maintain( the plunger in its upper-1 most operative position, wherein it renders the cutters operative. Upwardly projecting dogs 30 have their lower, reduced ends 31 pivotally mounted within terminal slots 32 in the cross-head, limiting shoulders 33 being provided upon these dogs at a short distance above the upper face ofthe crosshead for engagement therewith, to limit the swinging movement thereof to such an eX- tent that the body portions of the dogs will not project outwardly past the outer periphery of the body 1 of the tool. These ogs are adapted for movement through the longitudinal grooves 34 which are provided in the outer periphery of the body 1 in communication with the slot 27 and extending upwardly therefrom. An actuating lug 35 is formed upon the free end of each dog 30 and is adapted to project outwardlyfrom the body 1 when the dog is in its uppermost, inoperative position. The body grooves. 34 are deepened at their lower ends to provide recesses 36, which are adapted to Athe lugs and consequently the receive the free ends ofthe dogs /30 when in their lowermost operative position, so that the lugs 35 may drop into, the groovesvland thus be unobstructing when the plunger is 1noperative. The upper walls 37 of the groove form shoulders for locking engagement with erative positions, wherein they are maintained-by contact between the outer longitudinal edges of the lugs 35'and theinner periphery of a well casing through which`the tool may be passing. The upper end of each actuating lug 35 is beveled as at 38 for a purpose which will be described more fully hereinafter, I

'1 The operation of the device will now be described. Prior" to lowering the tool through a well casing, such as is indicated by the numeral 39, the cross-head 28 is depressed into operative position against the action of the resetting spring 29 for the plunger, until the free ends of the dogs 30 are engaged with the locking shoulders 37. The plunger will thus be depressed into its inoperative position so as to permit the outi lower end ofthe casing, the actuating lugs will be released, thus permitting the dogs to move outwardly and release the plunger, which -latter will be thrust upwardly into operative position bythe action of its resetting spring. The expanding enlargement I 21 Aand head 22 will thus operate to render the cutters operative and maintain the same rigidly in proper relation to the body 2 for active use. When it is desiredl to withdraw the tool through thel casing, its body is.` 5

drawn upwardly, whereupon the beveled end faces 38 of the actuating `ugs will become engaged with the lower?i end of the tube so as to thrust the dogsjjdownw'ardly to the limit of their movement, whereupon the' said casing end will operte to thrust free ends of the respective dogs'inwardly i tooperative engagement with the locking boulders 37. This operation of the dogs will move the plunger downwardly into'inoperative position releasing the cutters and permitting the same to collapse for free movement through the casing. Owing to the manner in which the cutters are connected with the body of the tool, they may be removed readily for the purpose of sharpening or replacing' the same by new vcutters by merely removing the pin 4'whi1e the plunger is inoperative,

ally from the outer periphery of the body in operative position and being adapted to collapse into inoperative position, a longitudinally adjustable plunger mounted within the body, an expanding head provided upon the lower endfof said plunger for wedging engagement with the cutters when moved upwardly into operative position, yieldable means for normally maintaining vthe-plunger in its operative position, the body being provided with a longitudinal slot opening through its outer periphery and with a longitudinal groove in the said periphery in communication with the upper end of the slot, a cross-head mounted fixedly upon the plunger for movement within the body slot, and an upwardly projecting dog pivotally mounted upon the outer end of the crosshead :for movement within the said body groove, the body being provided in the lower end of the said groove with a recess affording an inclined upper wallv for lockv ing engagement with the free end of the dog when the plunger is in its depressed, inoperative position.

2. An under-reamer comprising an elongated body having a socket in its lowerend, a plurality of cutters having their upper ends pivotally mounted within the body socket for radial swinging movement, the said cutters being adaptedl to project laterally from the outer periphery of the body in operative, position and being adapted to collapse into inoperative position, 'a longitudinally adjustable plunger mounted within the body, an expanding head provided upon the lower end of said plunger -for wedging engagement with the cutters when moved upwardly into operative position, yieldable means for normally maintaining the plunger in its operative position, the body being provided with' a longitudinal slot opening through its outer periphery and with a longitudinal groove in the said periphery incommunication with they upper end of the slot, a cross-head mounted fixedly upon the plunger for movement within the body slot, an upwardly projecting dog pivotally mounted'upon the outer end of the cross-head for movement within the said body groove, the body being provided in the locwer end of thesaid groove with a recess aifording an inclined upper wall for locking engagement with the free end of the dog when the plunger is in its depressed,

- inoperative position, and an actuating lug formed upon the outer edge of the said dog and being adapted to project outwardly from the body when v`the dog is in its uppermost, inoperative position and to be contained within the body groove when the dog is operative.

3. An under-reamer comprising an elongated body having a socket in its lower end, a plurality of cutters having their upper ends pivotally mounted within the body socket for radial swinging movement, the said cutters being adapted to project laterally from the outer periphery `of the body in operativeposition and being adapted to collapse into inoperative position, aylongitudinally adjustable plunger mounted within the body, an expanding head provided upon the lower end of said plunger for wedging engagement with the cutters when moved upwardly into operative position,

" yieldable means for normally maintaining 'the plunger in its operative position, the

body being provided with a longitudinal slot opening through its outer periphery and with a longitudinal groove in the said periphery in communication with the upper end of the slot, a cross-head mounted ixedly upon the plunger for movement within the bo'dyslot, an upwardly projecting dog pivotally mounted upon the outer end of the cross-head for movement within the said body groove, the body being provided in the lower end of the said groove with a recess affording an yinclined upper wall for locking engagement with the free end of 'the dog when the plunger is in its depressed, inoperative position, and an actuating lug formed'upon the outer edge of the said dog andfbeing adapted to project outwardly from the' body when the dog is in its uppermost, inoperative' position and to be contained within the body groove when the dog is operative, the upper face of the actuating lug being inclined longitudinally.

4. An under-reamer comprising an elongated body having a longitudinal socket in its lower end, the lower end portion of the socket being enlarged, a supporting member adaptedto -be mounted removably within the body socket with its lower end projecting into vthe enlarged portion thereof, a

. plurality of cutters pivotally connected with the lower end of the supporting member and being adapted to project through the lower end of the socket and laterally from the outer periphery of the body when operative, and means oresecurlng the sup- 3porting member detachably wlthin the? body.

5. An under-reamer comprising an elongated bodv having a longitudinal socket in its lovi'er end, the lower end portion of the l socket being enlarged, a supporting member adapted to loe/mounted removably within the body socket with its lower end projecting intI the enlarged portion thereof, a plurality of cutters pivotally connected with the lower end of the supporting member and being adapted toproject through the lower end of the socket and laterally from the outer periphery of the body when operative, the body and supporting member' beingprovided with alining transverse openings, and a securing pin adaptedto be mounted removably within said opening.

6. An under-reamer comprising an elongated body having a longitudinal socket in its lower end, the lower end portion of erally from the outer periphery of the body4 when operative, the body and supporting member being'provided with alining transverse openings, a, securing pin adapted to be mounted removably within said opening, the supporting member and the wall of the body socket being provided with alining longitudinal slots, and a key mounted within the said slot.

7 An under-reamer comprising an elon gated body having a longitudinal. `socket in its lower end, the lower end portionjof the socket being enlarged, a supporting member adapted to be mounted removably lwithin the body socket with its lower end projecting into the enlarged portion thereof, a plurality of radial pin-s provided upon.

the outer periphery of the supporting member at'thelower end thereof, a plurality of cutters having radial openings in their upper ends loosely engageable with the pins of the supporting member, the said cutters being adapted to A'protrude from the body socket and to project laterally from the outer periphery of the body when operative,

and adjustable means for securing the cutters vin their expanded, operative positions.

In testimony whereof I aiiix lmy signature in presence of two witnesses.

FRANK A. HAUGH. Witnesses:

E. C. ZmGLnR, E. CLARK. 

